Demolition Herby is similar to Amidar in that your objective is to fill in all of the blank squares by moving your vehicle, a green car named Herby, around the perimeter of each square. As Herby drives around, he leaves a red trail behind him. Hindering your objective are three chase cars that attempt to ram into Herby. These enemy cars will also undo any perimeter lines you may have drawn.
You are not completely defenseless against the chase cars however, as you may ram them from behind to knock them off the game board temporarily.
Use your accelerator button to speed up and ram cars, but be warned, your pursuers can increase their speed as well. You cannot change the perimeter color when you are speeding, unless all of the pursuer cars have been knocked off the track.
In addition to watching out for the chase cars, Herby must also watch his fuel gauge, which depletes steadily. Gain back fuel by filling in the blocks.
In the two-player variation of Demolition Herby, player two takes control of the chaser cars and attempts to ram player one.